Organic light emitting display device

ABSTRACT

An organic light emitting display device includes an organic light emitting display panel including first to third pixels that emit light of different colors, a wavelength of a color light emitted from the third pixel being shorter than wavelengths of color lights emitted from the first and second pixels, a window on an upper portion of the display panel, and a light shielding pattern on the window, the light shielding pattern being adjacent to an outline of the third pixel.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a divisional application based on pending application Ser. No.13/748,992, filed Jan. 24, 2013, the entire contents of which is herebyincorporated by reference.

This application claims priority under 35 U.S.C. §119 to Korean PatentApplication No. 10-2012-0088986, filed on Aug. 14, 2012 in the KoreanIntellectual Property Office, the disclosure of which is incorporatedherein in its entirety by reference.

BACKGROUND

1. Field

Embodiments relate to an organic light emitting display device.

2. Description of the Related Art

According to a trend of providing lightweight and thin-film home displaydevices such as TVs and monitors, and also, portable display devicessuch as notebook computers, cellular phones, and portable media players(PMPs), various flat display devices have been developed. The flatdisplay devices include a display panel for displaying images, and maybe classified as liquid crystal display devices, organic light emittingdisplay devices, and electrophoretic display devices according to thekind of display panels.

SUMMARY

Embodiments are directed to an organic light emitting display devicethat includes an organic light emitting display panel including a firstpixel, a second pixel, and a third pixel, which emit light of differentcolors, a wavelength of a color light emitted from the third pixel beingshorter than wavelengths of color lights emitted from the first andsecond pixels, a window on an upper portion of the display panel, and alight shielding pattern on the window, the light shielding pattern beingadjacent to an outline of the third pixel.

The light shielding pattern may be on an upper surface of the window.

The organic light emitting display device may further include a coatinglayer on the upper surface of the window and the light shieldingpattern.

The light shielding pattern may be on a lower surface of the window.

The light shielding pattern may be adjacent to two facing side surfacesof the third pixel.

The light shielding pattern may surround the third pixel.

Embodiments are also directed to an organic light emitting displaydevice that includes an organic light emitting display panel including afirst pixel, a second pixel, and a third pixel, which emit light ofdifferent colors, a wavelength of a color light emitted from the thirdpixel being shorter than wavelengths of color lights emitted from thefirst and second pixels, a window on an upper portion of the displaypanel, and a diffusion pattern on the window, the diffusion patternbeing adjacent to an outline of the third pixel.

The diffusion pattern may include a plurality of diffusion particles. Adiameter of the diffusion particles may be equal to or less than 1/10 ofthe wavelength of the color light emitted from the third pixel.

The color light emitted from the third pixel may be blue. The diameterof the diffusion particle may be equal to or less than 45 nm.

The diffusion pattern may be on an upper surface of the window.

The organic light emitting display device may further include a coatinglayer on the upper surface of the window and the diffusion pattern.

The diffusion pattern may be on a lower surface of the window.

The diffusion pattern may be adjacent to two facing side surfaces of thethird pixel.

The diffusion pattern may surround the third pixel.

Embodiments are also directed to an organic light emitting displaydevice that includes an organic light emitting display panel including afirst pixel, a second pixel, and a third pixel, which emit light ofdifferent colors, a wavelength of a color light emitted from the firstpixel being longer than wavelengths of color lights emitted from thesecond and third pixels, a window on an upper portion of the displaypanel, and a first diffusion pattern on the window, the first diffusionpattern overlapping the first pixel.

The first diffusion pattern may be on an upper surface of the window.

The organic light emitting display device may further include a coatinglayer on the upper surface of the window and the first diffusionpattern.

The first diffusion pattern may be on a lower surface of the window.

The organic light emitting display device may further include a seconddiffusion pattern on the window, the second diffusion patternoverlapping the second pixel. The wavelength of the color light emittedfrom the second pixel may be longer than the wavelength of the colorlight emitted from the third pixel. The first diffusion pattern and thesecond diffusion pattern may be on an upper surface of the window.

The organic light emitting display device may further include a seconddiffusion pattern on the window, the second diffusion pattern beingarranged to overlap the second pixel. The wavelength of the color lightemitted from the second pixel may be longer than the wavelength of thecolor light emitted from the third pixel. The first diffusion patternand the second diffusion pattern are on a lower surface of the window.

BRIEF DESCRIPTION OF THE DRAWINGS

Features will be more apparent from the following detailed descriptiontaken in conjunction with the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of an organic light emitting displaydevice according to an embodiment;

FIG. 2 is a plan view of an organic light emitting display deviceaccording to an embodiment;

FIG. 3 is a plan view of an organic light emitting display deviceaccording to another embodiment;

FIG. 4 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment;

FIG. 5 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment;

FIG. 6 is a plan view of an organic light emitting display deviceaccording to still another embodiment;

FIG. 7 is a plan view of an organic light emitting display deviceaccording to still another embodiment;

FIG. 8 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment;

FIG. 9 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment;

FIG. 10 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment;

FIG. 11 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment; and

FIG. 12 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment.

DETAILED DESCRIPTION

Embodiments will now be described more fully hereinafter with referenceto the accompanying drawings, in which preferred embodiments are shown.These, however, may be embodied in different forms and should not beconstrued as limited to the embodiments set forth herein. Rather, theseembodiments are provided so that this disclosure will be thorough andcomplete, and will fully convey the scope thereof to those skilled inthe art. The same reference numbers indicate the same componentsthroughout the specification. In the attached figures, the thickness oflayers and regions is exaggerated for clarity.

It will also be understood that when a layer is referred to as being“on” another layer or substrate, it can be directly on the other layeror substrate, or intervening layers may also be present. In contrast,when an element is referred to as being “directly on” another element,there are no intervening elements present.

Hereinafter, preferred embodiments will be described in detail withreference to the accompanying drawings.

FIG. 1 is a cross-sectional view of an organic light emitting displaydevice according to an embodiment.

Referring to FIG. 1, an organic light emitting display device 1000includes an organic light emitting display panel 100, a window 200, anda light shielding pattern 300.

The organic light emitting display panel 100 includes first to thirdpixels PX1, PX2, and PX3. The first to third pixels PX1, PX2, and PX3may be divided to be spaced apart from one another by a non-lightemission region. The first to third pixels PX1, PX2, and PX3 may emitcolor lights having different wavelengths. The wavelength of a colorlight emitted from the third pixel PX3 may be shorter than thewavelengths of color lights emitted from the first and second pixels PX1and PX2, and the wavelength of the color light emitted from the secondpixel PX2 may be shorter than the wavelength of the color light emittedfrom the first pixel PX1. For example, the first pixel PX1 may emit ared light, the second pixel PX2 may emit a green light, and the thirdpixel PX3 may emit a blue light.

The window 200 may be arranged on an upper portion of the organic lightemitting display panel 100. More specifically, the window 200 may bearranged on paths of lights emitted from the first to third pixels PX1,PX2, and PX3. The window 200 may protect the organic light emittingdisplay panel 100 from an external impact. The window 200 may be formedof a transparent material to transmit the light emitted from the firstto third pixels PX1, PX2, and PX3. For example, the window 200 may beformed of glass, PE (polyethyleneterephthalate), PC (polycarbonate), PES(polyethersulfone), PI (polyimide), or PMMA (polymethylmethacrylate), asexamples.

The light shielding pattern 300 may be formed of a material that doesnot transmit the light, and more specifically, may be formed of a blackmaterial. In some embodiments, the light shielding pattern 300 may beformed of a black semi-transparent material to shield only a part of thelight.

The light shielding pattern 300 may be arranged on the upper surface ofthe window 200. More specifically, the light shielding pattern 300 maybe arranged on the upper surface of the window 200 to be adjacent to theoutline of the third pixel PX3. The light shielding pattern 300 may bearranged adjacent to the outline of the third pixel PX3, and maypartially shield the light emitted from the third pixel PX3 as seen tobe aside from the front of the organic light emitting display device1000. Accordingly, in the case of seeing the organic light emittingdisplay device from the side rather than in the case of seeing theorganic light emitting display device from the front, the light emittedfrom the third pixel PX3, which emits light having a relatively shortwavelength compared to the first pixel PX1 and the second pixel PX2, canbe further shielded. If it is assumed that the angle that is formedbetween a user's gaze and the upper surface of the organic lightemitting display panel 100 that is the light emitting surface is awatching angle, the light emitted from the third pixel PX3 can befurther shielded. In the organic light emitting display device accordingto an embodiment, the light shielding pattern 300 is arranged adjacentto the outline of the third pixel PX3, and the shielding degree of lightemitted from the third pixel PX3 having a relatively short wavelengthbecomes higher as the degree of secession of the watching angle from 90°becomes greater. Accordingly, the blue shift of the color depending onthe watching angle can be compensated for, and the color shift can bereduced even if the watching angle is changed.

Hereinafter, referring to FIG. 2, the light shielding pattern 300 willbe described in more detail. FIG. 2 is a plan view of an organic lightemitting display device according to an embodiment.

Referring to FIG. 2, a light shielding pattern 300 may be arranged tosurround the third pixel PX3. If the light shielding pattern 300 isarranged to surround the third pixel PX3, the light shielding pattern300 shields the light emitted from the third pixel PX3 even if thewatching angle deviates from 90° in the horizontal and verticaldirections, and the color shift depending on the change of the watchingangle can be reduced.

FIGS. 1 and 2 illustrate that the light shielding pattern 300 is formedto meet properly with the edge of the third pixel PX3. However, in otherimplementations, the light shielding pattern 300 may partially overlapthe third pixel PX3, or may be arranged to be spaced apart from the edgeof the third pixel PX3 for a predetermined distance on a plan view.

Although FIG. 2 illustrates that the light shielding pattern 300completely surround the edge of the third pixel PX3, this may be variedaccording to implementations. For example, the light shielding pattern300 may be formed as plural patterns that are spaced apart from eachother, or the light shielding pattern 300 may be arranged adjacent toonly a partial region of the outline of the third pixel PX3 in order todifferently control the color shift depending on the direction in whichthe organic light emitting display device 1000 is visually recognized.

Referring again to FIG. 1, the organic light emitting display device1000 may further include a coating layer 400. The coating layer 400 maybe arranged on the upper surface of the window 200 and the upper portionof the light shielding pattern 300. The coating layer 400 may preventthe light shielding pattern 300 from being worn or from separating fromthe window 200. In some embodiments, the coating layer 400 may beomitted.

Hereinafter, referring to FIG. 3, another embodiment will be described.FIG. 3 is a plan view of an organic light emitting display deviceaccording to another embodiment.

Referring to FIG. 3, a light shielding pattern 310 may be arrangedadjacent to two side surfaces, which face each other, of the third pixelPX3. That is, the light shielding pattern 310 may be arranged adjacentto the left side and the right side of the outline of the third pixelPX3, but may be omitted from a region that is adjacent to the upper sideand the lower side thereof. In the case of a large-size display devicesuch as a TV, since the change of the watching angle is more likely tooccur in the horizontal direction rather than the vertical direction,the light shielding pattern 310 is arranged adjacent in the horizontaldirection of the third pixel PX3 to selectively relieve the color shiftdepending on the change of the watching angle in the horizontaldirection. In other aspects, the light shielding pattern 310 may besubstantially the same as the light shielding pattern 300 illustrated inFIG. 1.

The cross-sectional view of the organic light emitting display device1010 in FIG. 3 may be substantially the same as that in FIG. 1.

Hereinafter, referring to FIG. 4, still another embodiment will bedescribed. FIG. 4 is a cross-sectional view of an organic light emittingdevice according to still another embodiment.

Referring to FIG. 4, an organic light emitting display device 1020 mayinclude a light shielding pattern 320 arranged on the lower surface ofthe window 200. More specifically, the light shielding pattern 320 maybe arranged on the lower surface of the window 200 to be adjacent to theoutline of the third pixel PX3. Even if the light shielding pattern 320is arranged on the lower surface of the window 200, the shielding degreeobtained by the light shielding pattern 320 of light emitted from thethird pixel PX3 having a relatively short wavelength can be heightenedas the degree of secession of the watching angle from 90° becomesgreater. Thus, the color shift depending on the watching angle can bereduced. If the light shielding pattern 320 is arranged on the lowersurface of the window 200, the light shielding pattern 320 is locatedinside the organic light emitting display device 1020, and thus thelight shielding pattern 320 may be prevented from being worn. A separatecoating layer may be omitted in the organic light emitting displaydevice 1020. In other aspects, the light shielding pattern 320 may besubstantially the same as the light shielding pattern 300 illustrated inFIG. 1.

The plan view of the organic light emitting display device 1020 may besubstantially the same as the plan view of the organic light emittingdisplay device 1000 or 1010 in FIG. 2 or 3.

Hereinafter, referring to FIGS. 5 and 6, still another embodiment willbe described. FIG. 5 is a cross-sectional view of an organic lightemitting device according to still another embodiment.

Referring to FIG. 5, an organic light emitting display device 1100includes an organic light emitting display panel 100, a window 200, anda diffusion pattern 500.

The diffusion pattern 500 may be arranged on the upper surface of thewindow 200. More specifically, the diffusion pattern 500 may be arrangedon the upper surface of the window 200 to be adjacent to the outline ofthe third pixel PX3. The diffusion pattern 500 may be arranged adjacentto the outline of the third pixel PX3, and may scatter the light emittedin the direction that deviates from the front of the third pixel PX3 tocause a part of the scattered light to propagate toward the front side.That is, the diffusion pattern 500 can decrease the quantity of lightthat propagates in the direction that deviates from the front, among thelight emitted from the third pixel, and increase the quantity of lightthat propagates to the front. Accordingly, the organic light emittingdisplay device 1100 includes the diffusion pattern 500 that is arrangedon the upper surface of the window 200 to be adjacent to the outline ofthe third pixel PX3, and decreases the quantity of light that propagatesin a direction that deviates from the front, among the light emittedfrom the third pixel PX3 having a relatively short wavelength.Accordingly, the blue shift of the color depending on the watching anglecan be compensated for, and the shift of the color can be reduced evenif the watching angle is changed.

The diffusion pattern 500 may include a plurality of diffusion particles501. In some embodiments, the diffusion particles 501 may be particlesthat are small enough to generate Rayleigh scattering. The Rayleighscattering occurs effectively as the wavelength becomes shorter, and ifthe diffusion particles 501 are particles that are small enough togenerate the Rayleigh scattering, the light emitted from the third pixelPX3 having a relatively small wavelength among the first to third pixelsPX1, PX2, and PX3 can be effectively scattered. Thus, the shift of thecolor depending on the change of the watching angle can be effectivelyreduced. For example, if the third pixel is a blue pixel, the wavelengthof the blue light may be about 450 nm. The diameter of the diffusionparticles 501 for the Rayleigh scattering may be equal to or smallerthan 45 nm, that is, 1/10 of the wavelength of the blue light.

FIG. 5 illustrates that the diffusion pattern 500 is formed to includethe diffusion particles 501. However, in other implementations, forexample, the diffusion pattern may be formed to include a prism array ora plurality of lenses. Further, the diffusion pattern 500 may be formedby forming a concavo-convex shape on the surface of the window.

FIG. 6 is a plan view of an organic light emitting display deviceaccording to still another embodiment. Referring to FIG. 6, thediffusion pattern 500 may be arranged to surround the third pixel PX3.If the diffusion pattern 500 is arranged to surround the third pixelPX3, the diffusion pattern 500 may decrease the quantity of light thatis emitted from the third pixel PX3 in a direction that deviates fromthe front in the horizontal and vertical directions. Thus, the shift ofthe color can be reduced even if the watching angle is changed in thehorizontal or vertical direction.

FIGS. 5 and 6 illustrate that the diffusion pattern 500 is formed tomeet with the edge of the third pixel PX3. In other implementations, thediffusion pattern 500 may partially overlap the third pixel PX3, or maybe arranged to be spaced apart from the edge of the third pixel PX3 fora predetermined distance on a plan view.

Although FIG. 6 illustrates that the diffusion pattern 500 completelysurround the edge of the third pixel PX3, this may be changed in otherimplementations. For example, the diffusion pattern 500 may be formed asplural patterns that are spaced apart from each other, or the diffusionpattern 500 may be arranged adjacent to only a partial region of theoutline of the third pixel PX3 in order to differently control the colorshift depending on the direction in which the organic light emittingdisplay device 1100 is visually recognized.

Referring again to FIG. 5, the organic light emitting display device1100 may further include a coating layer 400. The coating layer 400 maybe arranged on the upper surface of the window 200 and the upper portionof the diffusion pattern 500. The coating layer 400 may prevent thediffusion pattern 500 from being worn or separating from the window 200.In some implementations, the coating layer 400 may be omitted.

Hereinafter, referring to FIG. 7, another embodiment will be described.FIG. 7 is a plan view of an organic light emitting display deviceaccording to another embodiment.

Referring to FIG. 7, a diffusion pattern 510 may be arranged adjacent totwo side surfaces of the third pixel PX3 that face each other. Thediffusion pattern 510 may be arranged adjacent to the left side and theright side of the outline of the third pixel PX3, and may be omittedfrom a region that is adjacent to the upper side and the lower sidethereof. In the case of a large-size display device such as a TV, thechange of the watching angle may be more likely to occur in thehorizontal direction rather than the vertical direction. Accordingly,the diffusion pattern 510 may be arranged adjacent in the horizontaldirection of the third pixel PX3 to selectively relieve the color shiftdepending on the change of the watching angle in the horizontaldirection. In other aspects, the diffusion pattern 510 may besubstantially the same as the diffusion pattern 500 illustrated in FIG.5.

The cross-sectional view of the organic light emitting display device1110 in FIG. 7 may be substantially the same as that in FIG. 5.

Hereinafter, referring to FIG. 8, still another embodiment will bedescribed. FIG. 8 is a cross-sectional view of an organic light emittingdevice according to still another embodiment.

Referring to FIG. 8, an organic light emitting display device 1120 mayinclude a diffusion pattern 520 arranged on the lower surface of thewindow 200. More specifically, the diffusion pattern 520 may be arrangedon the lower surface of the window 200 to be adjacent to the outline ofthe third pixel PX3. Even if the diffusion pattern 520 is arranged onthe lower surface of the window 200, the color shift depending on thewatching angle can be reduced by decreasing the quantity of light thatis emitted from the third pixel PX3 and that propagates in a directionthat deviates from the front of the organic light emitting display panel100. If the diffusion pattern 520 is arranged on the lower surface ofthe window 200, the diffusion pattern 520 is located inside the organiclight emitting display device 1120. Thus, the diffusion pattern 520 maybe prevented from being worn, and a separate coating layer may beomitted in the organic light emitting display device 1120. In otheraspects, the diffusion pattern 520 may be substantially the same as thediffusion pattern 500 illustrated in FIG. 5.

The plan view of the organic light emitting display device 1120 may besubstantially the same as the plan view of the organic light emittingdisplay device 1100 or 1110 in FIG. 6 or 7.

Hereinafter, referring to FIG. 9, still another embodiment will bedescribed.

FIG. 9 is a cross-sectional view of an organic light emitting deviceaccording to still another embodiment. Referring to FIG. 9, an organiclight emitting display device 1200 includes an organic light emittingdisplay panel 100, a window 200, and a first diffusion pattern 600.

The first diffusion pattern 600 may be arranged on the upper surface ofthe window 200 to overlap the first pixel PX1. The first diffusionpattern 600 may scatter the light emitted from the first pixel PX1 andincrease the quantity of light that is emitted from the first pixel PX1and propagates in a direction that deviates from the front of theorganic light emitting display device 100. Accordingly, if the watchingangle deviates from 90°, the first diffusion pattern 600 can compensatefor the blue shift of the color depending on the change of the watchingangle by increasing the recognized quantity of light that is emittedfrom the first pixel PX1 and has a relatively long wavelength. Thus, theshift of the color can be reduced even if the watching angle is changed.

The first diffusion pattern 600 may include a plurality of diffusionparticles 601. FIG. 9 illustrates that the first diffusion pattern 600is formed to include the diffusion particles 601. In otherimplementations, the diffusion pattern 600 may be formed to include aprism array or a plurality of lenses. Further, the diffusion pattern 600may be formed by forming a concavo-convex shape on the surface of thewindow.

The organic light emitting display device 1200 may further include acoating layer 400. The coating layer 400 may be arranged on the uppersurface of the window 200 and the upper portion of the first diffusionpattern 600. The coating layer 400 may prevent the first diffusionpattern 600 from being worn or separating from the window 200. In someembodiments, the coating layer 400 may be omitted.

Hereinafter, referring to FIG. 10, another embodiment will be described.FIG. 10 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment.

Referring to FIG. 10, an organic light emitting display device 1210 mayinclude a first diffusion pattern 610 arranged to overlap the firstpixel PX1 on the lower surface of the window 200. If the watching angledeviates from 90° even in a state where the first diffusion pattern 610is arranged on the lower surface of the window 200, the first diffusionpattern 610 may compensate for the blue shift of the color depending onthe change of the watching angle by increasing the recognized quantityof light that is emitted from the first pixel PX1 and has a relativelylong wavelength. Thus, the shift of color can be reduced even if thewatching angle is changed. If the first diffusion pattern 610 isarranged on the lower surface of the window 200, the first diffusionpattern 610 is located inside the organic light emitting display device1210. Thus, the first diffusion pattern 610 may be prevented from beingworn, and a separate coating layer may be omitted in the organic lightemitting display device 1210. In other aspects, the first diffusionpattern 610 may be substantially the same as the diffusion pattern 600illustrated in FIG. 9.

Hereinafter, referring to FIG. 11, still another embodiment will bedescribed.

FIG. 11 is a cross-sectional view of an organic light emitting deviceaccording to still another embodiment. Referring to FIG. 11, an organiclight emitting display device 1300 includes an organic light emittingdisplay panel 100, a window 200, a first diffusion pattern 600, and asecond diffusion pattern 700.

The second diffusion pattern 700 may be arranged on the upper surface ofthe window 200 to overlap the second pixel PX2. The second diffusionpattern 700 may scatter the light emitted from the first pixel PX1, andmay increase the quantity of light that is emitted from the second pixelPX2 and propagates in a direction that deviates from the front of theorganic light emitting display device 100. Accordingly, if the watchingangle deviates from 90°, the first diffusion pattern 600 and the seconddiffusion pattern 700 can compensate for the blue shift of the colordepending on the change of the watching angle by increasing therecognized quantity of light that is emitted from the first pixel PX1and the second pixel PX2 and has a wavelength longer than the wavelengthof the third pixel PX3. Thus, the shift of the color can be reduced evenif the watching angle is changed.

The second diffusion pattern 700 may include a plurality of diffusionparticles 701. FIG. 11 illustrates that the second diffusion pattern 700is formed to include the diffusion particles 701. In otherimplementations, the diffusion pattern 700 may be formed to include aprism array or a plurality of lenses. Further, the diffusion pattern 700may be formed by forming a concavo-convex shape on the surface of thewindow.

The light diffusion efficiency of the second diffusion pattern 700 maybe lower than that of the first diffusion pattern 600. The wavelength ofthe first pixel PX1 may be longer than that of the second pixel PX2. Ifthe watching angle deviates from 90°, the frequency may be shifted sothat the recognized light becomes closer to the light emitted from thesecond pixel PX2 rather than the light emitted from the first pixel PX1.Accordingly, if the light diffusion efficiency of the second diffusionpattern 700 is lower than that of the first diffusion pattern 600, thelight emitted from the first pixel PX1 may be made to further propagatein a direction that deviates from the front in comparison to the lightemitted from the second pixel PX2 to balance the colors recognized whenthe watching angle is changed.

In some embodiments, in order to make the light diffusion efficiency ofthe second diffusion pattern 700 lower than that of the first diffusionpattern 600, the size of the diffusion particles 701 included in thesecond diffusion pattern 700 may be larger than the size of thediffusion particles 601 included in the first diffusion pattern 600.Further, in some embodiments, in order to make the light diffusionefficiency of the second diffusion pattern 700 lower than that of thefirst diffusion pattern 600, the number of diffusion particles 701included in the second diffusion pattern 700 may be smaller than thenumber of diffusion particles 601 included in the first diffusionpattern 600.

Hereinafter, referring to FIG. 12, another embodiment will be described.FIG. 12 is a cross-sectional view of an organic light emitting displaydevice according to still another embodiment.

Referring to FIG. 12, an organic light emitting display device 1310 mayinclude a first diffusion pattern 610 arranged to overlap the firstpixel PX1 and a second diffusion pattern 710 arranged to overlap thesecond pixel PX2 on the lower surface of the window 200. If the watchingangle deviates from 90° even in a state where the first diffusionpattern 610 and the second diffusion pattern 710 are arranged on thelower surface of the window 200, the first diffusion pattern 610 and thesecond diffusion pattern 710 may compensate for the blue shift of thecolor depending on the change of the watching angle by increasing therecognized quantity of light that is emitted from the first pixel PX1and the second pixel PX2 and has a relatively long wavelength incomparison to the wavelength of the light emitted from the third pixelPX3. Thus, the shift of the color can be reduced even if the watchingangle is changed. If the first diffusion pattern 610 and the seconddiffusion pattern 710 are arranged on the lower surface of the window200, the first diffusion pattern 610 and the second diffusion pattern710 are located inside the organic light emitting display device 1310.Thus, the first diffusion pattern 610 and the second diffusion pattern710 may be prevented from being worn, and a separate coating layer maybe omitted in the organic light emitting display device 1310.

In other aspects, the first diffusion pattern 610 and the seconddiffusion pattern 710 may be substantially the same as the firstdiffusion pattern 600 and the second diffusion pattern 700 illustratedin FIG. 11.

By way of summation and review, an organic light emitting display devicemay include an organic light emitting layer that is arranged between afirst electrode and a second electrode. The organic light emitting layermay display grayscales corresponding to current flowing between thefirst electrode and the second electrode. The organic light emittinglayer may emit light with various colors according to compounds thereof.For example, the organic light emitting display device may display animage by forming pixels with the organic light emitting layer that emitslight of red, blue, and green. If a watching angle with respect to theorganic light emitting display device is changed, a resonance distancebetween the first electrode and the second electrode may be changed tocause pixel colors to be shifted. More specifically, in the case ofseeing the organic light emitting display device from the side ratherthan in the case of seeing the organic light emitting display devicefrom the front, components having a short wavelength may becomedominant, and the pixel color may be tinged with blue in comparison tothe original color.

Accordingly, embodiments may relate to an organic light emitting displaydevice that may reduce color shift depending on the change of a viewingangle. That is, embodiments may provide an organic light emittingdisplay device that may reduce or prevent a color shift even if theviewing angle is changed.

Although preferred embodiments have been described for illustrativepurposes, those skilled in the art will appreciate that variousmodifications, additions and substitutions are possible, withoutdeparting from the scope and spirit of the invention as disclosed in theaccompanying claims.

1.-14. (canceled)
 15. An organic light emitting display device,comprising: an organic light emitting display panel including a firstpixel, a second pixel, and a third pixel, which emit light of differentcolors, a wavelength of a color light emitted from the first pixel beinglonger than wavelengths of color lights emitted from the second andthird pixels; a window on an upper portion of the display panel; and afirst diffusion pattern on the window, the first diffusion patternoverlapping the first pixel.
 16. The organic light emitting displaydevice of claim 15, wherein the first diffusion pattern is on an uppersurface of the window.
 17. The organic light emitting display device ofclaim 16, further comprising a coating layer on the upper surface of thewindow and the first diffusion pattern.
 18. The organic light emittingdisplay device of claim 15, wherein the first diffusion pattern is on alower surface of the window.
 19. The organic light emitting displaydevice of claim 15, further comprising a second diffusion pattern on thewindow, the second diffusion pattern overlapping the second pixel,wherein: the wavelength of the color light emitted from the second pixelis longer than the wavelength of the color light emitted from the thirdpixel, and the first diffusion pattern and the second diffusion patternare on an upper surface of the window.
 20. The organic light emittingdisplay device of claim 15, further comprising a second diffusionpattern on the window, the second diffusion pattern being arranged tooverlap the second pixel, wherein: the wavelength of the color lightemitted from the second pixel is longer than the wavelength of the colorlight emitted from the third pixel, and the first diffusion pattern andthe second diffusion pattern are on a lower surface of the window.